Windows 11 Update Causing SSD Failures: Microsoft Investigates Critical Storage Bug
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Microsoft has issued a new support bulletin addressing reports that, following the installation of security update KB5063878 on Windows 11, some users have experienced severe storage issues, with both solid-state drives (SSDs) and, in rare cases, mechanical hard drives becoming unrecognized or failing entirely during sustained large-volume data writes.
According to the company, it is actively collaborating with storage partners in an effort to reproduce the problem. However, internal testing has so far failed to replicate the issue, and analysis of telemetry data has likewise revealed no anomalies.
Microsoft is therefore urging affected users to submit diagnostic data, including system logs, to aid its investigation. Individual consumers encountering the issue are encouraged to file a report through the Feedback Hub, while enterprise customers are advised to have their IT administrators submit cases directly through the Enterprise Support Center, enabling Microsoft to gather detailed information for more precise analysis.
The anomaly was first brought to light by a Japanese user who conducted extensive tests across multiple SSDs. Results suggested that after installing either the Windows 11 24H2 KB5062660 preview update or the KB5063878 security update, drives with more than 60% capacity in use could fail when subjected to sustained writes exceeding 50GB, with some devices being reformatted to RAW, rendering them inaccessible. In certain cases, even rebooting the system failed to restore functionality.
Although the problem primarily affects SSDs, a small number of HDDs have reportedly shown similar failures. Drives powered by Phison controllers appear disproportionately represented among affected units, prompting Phison Electronics to issue its own statement confirming an ongoing joint investigation with partners.
As of this writing, both Microsoft and Phison remain engaged in active inquiry, but no conclusive findings have yet been reached. In Microsoft’s words, without successful reproduction of the bug, its very existence remains unconfirmed—let alone the possibility of issuing a definitive fix.
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